1578999020 has 12 divisors (see below), whose sum is σ = 3315897984. Its totient is φ = 631599600.

The previous prime is 1578998987. The next prime is 1578999029. The reversal of 1578999020 is 209998751.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1578999020.

It is not an unprimeable number, because it can be changed into a prime (1578999029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39474956 + ... + 39474995.

It is an arithmetic number, because the mean of its divisors is an integer number (276324832).

Almost surely, 2^1578999020 is an apocalyptic number.

1578999020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1578999020 is an abundant number, since it is smaller than the sum of its proper divisors (1736898964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1578999020 is a wasteful number, since it uses less digits than its factorization.

1578999020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78949960 (or 78949958 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 50.

The square root of 1578999020 is about 39736.6206414184. The cubic root of 1578999020 is about 1164.4672716442.

The spelling of 1578999020 in words is "one billion, five hundred seventy-eight million, nine hundred ninety-nine thousand, twenty".